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Ecology & Environment — Homi Bhabha Class 6 Biology MCQs with Solutions
Free Homi Bhabha Class 6 Biology Ecology & Environment MCQs with step-by-step solutions covering Ecosystems, Food Chains & Food Webs, Waste Management, Environmental Conservation. Practise online on Prepizo — no login needed.
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Sample questions with solutions
Q1 — Ecosystems · easy · theory
An ecosystem is made up of living things together with their surroundings. Which of these is an example of an ecosystem?
A. A pond ✓ Correct
B. A pencil
C. A plastic bag
D. A single stone
Solution: A pond has living things (fish, plants) and non-living surroundings (water, air), so it is an ecosystem.
Q2 — Ecosystems · easy · theory
Which of these is a LIVING (biotic) part of an ecosystem?
A. Sunlight
B. A rock
C. A tree ✓ Correct
D. Water
Solution: A tree is alive, so it is a living (biotic) part; a rock, water and sunlight are non-living.
Q3 — Ecosystems · easy · theory
Which of these is a NON-LIVING (abiotic) part of an ecosystem?
A. A frog
B. Sunlight ✓ Correct
C. A grass plant
D. A bird
Solution: Sunlight is non-living, so it is an abiotic part of the ecosystem.
Q4 — Ecosystems · easy · theory
A desert, a forest and a pond are all examples of:
A. machines
B. ecosystems ✓ Correct
C. planets
D. metals
Solution: Each one has living things and non-living surroundings, so each is an ecosystem.
Q5 — Food Chains & Food Webs · easy · theory
A food chain mainly shows how living things are linked by:
A. the water they drink
B. how fast they run
C. where they sleep
D. what they eat ✓ Correct
Solution: A food chain shows who eats whom, passing food and energy along.
Q6 — Food Chains & Food Webs · easy · theory
Most food chains begin with:
A. humans
B. rocks
C. lions
D. green plants ✓ Correct
Solution: Green plants make food using sunlight, so they start most food chains.
Q7 — Food Chains & Food Webs · easy · theory
In the food chain grass → deer → tiger, what does the deer eat?
A. grass ✓ Correct
B. rocks
C. water
D. tiger
Solution: The arrow from grass to deer shows that the deer eats grass.
Q8 — Food Chains & Food Webs · easy · theory
When many food chains are joined together, they form a:
A. food clock
B. food web ✓ Correct
C. food wall
D. food coin
Solution: Several food chains linked together make a food web.
Q9 — Waste Management · easy · theory
Waste that comes from plants and animals and rots away easily, like vegetable peels, is called:
A. metal waste
B. plastic waste
C. glass waste
D. biodegradable waste ✓ Correct
Solution: Biodegradable waste comes from living things and rots away naturally.
Q10 — Waste Management · easy · theory
Which of these should go into the bin for dry, recyclable waste?
A. a plastic bottle ✓ Correct
B. wet dead leaves
C. leftover food
D. a banana peel
Solution: A plastic bottle is dry waste that can be recycled, unlike wet food scraps.
Q11 — Waste Management · easy · theory
The three R's that help us deal with waste are Reduce, Reuse and:
A. Recycle ✓ Correct
B. Rest
C. Run
D. Read
Solution: The three R's are Reduce, Reuse and Recycle.
Q12 — Waste Management · easy · theory
Rotting vegetable and fruit peels can be turned into useful ______ for plants.
A. compost ✓ Correct
B. glass
C. metal
D. plastic
Solution: Kitchen waste can be composted into rich natural manure for plants.
Q13 — Environmental Conservation · easy · theory
Cutting down large numbers of trees from forests is called:
A. deforestation ✓ Correct
B. recycling
C. afforestation
D. composting
Solution: Deforestation means cutting down many trees, which harms the environment.
Q14 — Environmental Conservation · easy · theory
Planting many new trees to grow forests is called:
A. littering
B. deforestation
C. afforestation ✓ Correct
D. pollution
Solution: Afforestation means planting trees to make new forests.
Q15 — Environmental Conservation · easy · theory
We can save water while brushing our teeth by:
A. closing the tap while brushing ✓ Correct
B. throwing clean water away
C. letting the tap run the whole time
D. leaving all taps open
Solution: Turning off the tap while brushing saves a lot of clean water.
Q16 — Environmental Conservation · easy · theory
Which of these is a good way to save electricity at home?
A. switching off lights and fans when not needed ✓ Correct
B. keeping all lights on at night
C. running the TV all day
D. leaving the fridge door open
Solution: Switching off lights and fans when they are not in use saves electricity.
Q17 — Ecosystems · hard · theory
Why are decomposers important in an ecosystem?
A. They stop plants from growing
B. They eat all the green plants
C. They break down dead things and return nutrients to the soil ✓ Correct
D. They make the soil dirty and useless
Solution: Decomposers recycle nutrients from dead matter back into the soil so new plants can grow.
Q18 — Ecosystems · hard · theory
In a grassland, all the grass suddenly dies. What will most likely happen to the deer that eat the grass?
A. Their number will fall because they have less food ✓ Correct
B. Nothing at all will change
C. They will turn into plants
D. They will get much more food
Solution: With no grass to eat, the plant-eating deer have less food, so their numbers fall.
Q19 — Food Chains & Food Webs · hard · theory
In the food chain grass → grasshopper → frog → snake, which living thing is the producer?
A. grasshopper
B. snake
C. frog
D. grass ✓ Correct
Solution: The grass makes its own food using sunlight, so it is the producer at the start of the chain.
Q20 — Food Chains & Food Webs · hard · theory
In a food web, if all the frogs that eat insects die, the number of insects will most likely:
A. turn into plants
B. increase ✓ Correct
C. become zero
D. stay exactly the same
Solution: With fewer frogs left to eat them, more insects survive, so their number increases.
Q21 — Waste Management · hard · theory
Throwing plastic and other litter into rivers and seas is harmful mainly because it:
A. helps fish grow faster
B. makes the water tastier
C. pollutes the water and harms the animals living there ✓ Correct
D. cleans the water
Solution: Plastic waste pollutes the water and can hurt or kill the fish and animals that live there.
Q22 — Waste Management · hard · theory
Why is it a good idea to separate wet waste from dry waste at home?
A. so germs can grow
B. so wet waste can be composted and dry waste can be recycled ✓ Correct
C. to make more rubbish
D. so the bins look colourful
Solution: Separating waste lets wet waste become compost and dry waste be recycled, so less is thrown away.
Q23 — Environmental Conservation · hard · theory
Solar panels and windmills are called clean or "green" energy because they:
A. waste electricity
B. burn a lot of coal
C. produce heavy smoke
D. make energy without polluting the air ✓ Correct
Solution: Solar and wind energy make power without polluting the air, unlike burning coal.
Q24 — Environmental Conservation · hard · theory
Saving water, planting trees and using less plastic are all examples of:
A. making more pollution
B. wasting resources
C. conserving (protecting) the environment ✓ Correct
D. harming the environment
Solution: These actions protect our natural resources, which is what conservation of the environment means.
Q25 — Ecosystems · medium · theory
Green plants in an ecosystem are called producers because they:
A. make their own food using sunlight ✓ Correct
B. eat other animals
C. hunt small insects
D. drink only water
Solution: Plants make their own food from sunlight, so they are called producers.
Q26 — Ecosystems · medium · theory
Animals that eat plants or other animals for their food are called:
A. the sun
B. decomposers
C. consumers ✓ Correct
D. producers
Solution: Animals cannot make their own food, so they consume other living things and are called consumers.
Q27 — Ecosystems · medium · theory
Tiny living things like bacteria and fungi that break down dead plants and animals are called:
A. hunters
B. producers
C. predators
D. decomposers ✓ Correct
Solution: Decomposers break down dead matter and return nutrients to the soil.
Q28 — Ecosystems · medium · theory
The natural place where a plant or animal lives is called its:
A. habitat ✓ Correct
B. factory
C. market
D. hospital
Solution: A habitat is the natural home where a living thing lives, such as a pond for a fish.
Q29 — Food Chains & Food Webs · medium · theory
In a food chain, the arrow (→) points:
A. from the food to the animal that eats it ✓ Correct
B. the way the sun moves
C. from the eater to its food
D. the way the wind blows
Solution: The arrow points from the food to the eater, showing which way food and energy flow.
Q30 — Food Chains & Food Webs · medium · theory
Animals that eat only plants, like cows and deer, are called:
A. producers
B. decomposers
C. carnivores
D. herbivores ✓ Correct
Solution: Herbivores are animals that eat only plants.